My bathroom has white tiles, so when my kids  (5yrs & 2 yrs) want to paint, I either put them naked in the shower or bath with some poster paint and a paintbrush. 

They have so much fun painting the walls, themselves and each other.  When they are done, I just turn on the shower, wash down the walls and the little people and all the mess is gone in a flash.  They absolutely love it!

(this clever tip sent in by Ronel Lee - thx)
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